Hottest tree when burning

The heat content of any fire depends upon wood density, resin, ash, and moisture, but the tree that produces the most heat when burned is the osage-orange or horse-apple (Maclura pomifera), a large deciduous shrub-like plant belonging to the mulberry family, and distributed widely across North America. When burned, this species produces approximately 33 million British Thermal Units (BTU) per 20 per cent air-dried moisture content per cord. A cord of wood is an imperial unit still used widely in America (as is the BTU), and is defined as a piece of wood 4 ft wide by 4 ft high by 8 ft long (128 cubic ft), with an average 80 cubic ft of burnable wood, the remainder being air space.